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Schematic display of (A) the signal-amplified electrochemical biosensor for the detection of rHuEPO glycoprotein by using MBA-biotin-AuNPs as labels; (B) the label-free detection of miRNAs based on the triple signal amplification of APBA-biotin-AuNPs, SA-ALP, and the p-APredox-cycling reaction; and (C) the thyroxine biosensor in conditions of (up) absence and (down) presence of the analyte. Reproduced from [34] (A), [35] (B), and [38] (C) with permission.
